78044907780 has 432 divisors, whose sum is σ = 298024272000. Its totient is φ = 17062036992.

The previous prime is 78044907779. The next prime is 78044907799. The reversal of 78044907780 is 8770944087.

78044907780 is a `hidden beast` number, since 7 + 8 + 0 + 4 + 490 + 77 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5470096 + ... + 5484344.

It is an arithmetic number, because the mean of its divisors is an integer number (689871000).

Almost surely, 2^78044907780 is an apocalyptic number.

78044907780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78044907780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149012136000).

78044907780 is an abundant number, since it is smaller than the sum of its proper divisors (219979364220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78044907780 is a wasteful number, since it uses less digits than its factorization.

78044907780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310 (or 14289 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 78044907780 in words is "seventy-eight billion, forty-four million, nine hundred seven thousand, seven hundred eighty".